411. A synthetic protein preparation in water was studied by the method of equilibrium centrifugation at 20 °C and a speed of 12590 min-1. When the data were plotted in coordinates (squared distance/logarithm of concentration), two distinct linear regions were found, indicating the existence of two fractions of the drug. The following table shows two pairs of "points" related to these areas of the graph. Calculate the molar masses of the two fractions from them. Take the density of the solvent 1.00 g/cm3 and the specific volume of the preparation in the solution 0.73 g/cm3.
linear section 1 linear section 2
s, g/l 2.51 3.09 3.89 6.61
x, cm* 6.58 6.65 6.69 6.79

*x - distance from the axis of rotation

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